EUVD-2026-43892
GHSA-xqfq-fx8x-w875
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local second-stage EoP needing prior low-privilege access (AV:L/PR:L), reliable triggering needs memory grooming/race (AC:H); SYSTEM compromise yields full C/I/A within unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Access of resource using incompatible type ('type confusion') in Windows Kernel allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Kernel (CVE-2026-50390) lets an already-authenticated attacker abuse a type-confusion condition to run code with elevated (SYSTEM-level) privileges on affected Windows client and server builds ranging from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through Server 2025. Microsoft has shipped a fix and there is no public exploit identified at time of analysis, but as a kernel EoP it is a classic second-stage building block for turning a foothold into full host compromise. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must already have local, authenticated, low-privileged access to the target (CVSS PR:L, AV:L) - this is a second-stage privilege-escalation flaw, not remotely reachable. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are consistent and point to a moderate-but-real, not emergency, priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already obtained low-privileged code execution on a Windows host - for example via a phishing payload, a compromised service account, or a foothold on a shared terminal server - invokes the vulnerable kernel path with a crafted object/IOCTL to trigger the type confusion, corrupting kernel memory to overwrite a token or hijack control flow and escalate to SYSTEM. Because the CVSS vector is AV:L with AC:H, the attack must be performed locally and reliably winning it likely requires careful memory grooming or race timing; no public exploit is identified at time of analysis. |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-50390 to every affected build via the MSRC Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50390, which lists the exact KB and fixed build for each Windows client and server release (no single cross-branch version number applies, so use the per-build KB from the advisory rather than an invented version). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10 (build 1607 and later), Windows 11 (all versions through 26H1), and Windows Server 2012 through 2025 systems in your environment. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
More in Windows 10 Version 1607
View allLocal privilege escalation in Microsoft Active Directory Federation Services (AD FS) lets an already-authenticated low-p
Local privilege escalation in the Microsoft Windows Kernel allows an unauthorized attacker to gain elevated (SYSTEM-leve
Local privilege escalation in the Windows Win32K kernel subsystem (CWE-122 heap-based buffer overflow) lets an already-a
Local code execution in the Windows DHCP Client service stems from a use-after-free (CWE-416) memory-corruption flaw aff
Local code execution in the Microsoft Message Queuing (MSMQ) Queue Manager affects a broad range of Windows client and s
Remote code execution in the Microsoft Windows DHCP Server role allows an unauthenticated network attacker to run arbitr
Elevation of privilege in the Windows NTFS file-system driver lets an already-authenticated local user escalate to SYSTE
Local code execution in the Windows Media component of supported Windows 10, Windows 11, and Windows Server (2016 throug
Elevation of privilege in the Windows Hyper-V virtual network switch (VMSwitch) lets an authenticated attacker operating
Remote code execution in the Windows Server Network driver stems from a race condition (CWE-362) that lets an unauthoriz
Remote code execution in Microsoft Windows Remote Desktop (RDP) allows an unauthorized network attacker to run arbitrary
Remote code execution in Microsoft Windows Message Queuing (MSMQ) allows an unauthenticated attacker to run arbitrary co
Same technique Memory Corruption
View allShare
External POC / Exploit Code
Leaving vuln.today